31440364 has 12 divisors (see below), whose sum is σ = 57916600. Its totient is φ = 14892768.

The previous prime is 31440347. The next prime is 31440371. The reversal of 31440364 is 46304413.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206769 + ... + 206920.

Almost surely, 2^31440364 is an apocalyptic number.

It is an amenable number.

31440364 is a deficient number, since it is larger than the sum of its proper divisors (26476236).

31440364 is a wasteful number, since it uses less digits than its factorization.

31440364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413712 (or 413710 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 31440364 is about 5607.1707660816. The cubic root of 31440364 is about 315.6185511083.

Adding to 31440364 its reverse (46304413), we get a palindrome (77744777).

The spelling of 31440364 in words is "thirty-one million, four hundred forty thousand, three hundred sixty-four".